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A coil of inductance 300mH and resistanc...

A coil of inductance 300mH and resistance `2 Omega. The current reaches half of its steady state value in

A

`0.15 s`

B

`0.3 s`

C

`0.05 s`

D

`0.1 s`

Text Solution

Verified by Experts

The correct Answer is:
D
`i=i_(0)(1-e^((-Rt)/(L)))impliesFor i=(i_(0))/(2),t=0.693(L)/(R )`
`impliest=0.693xx(300xx10^(-3))/(2)=0.1sec`
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